Trump said there were “nasty, nasty, vicious robo calls” to voters against him in South Carolina about the confederate flag and about same-sex marriage that he alleged came from Cruz’s campaign manager.

Trump also took a swipe at Mitt Romney’s campaign strategist Stuart Stevens, who has been appearing on television giving analysis about how to defeat Trump. “This is the guy that couldn’t beat Obama,” Trump responded.

Trump previously tweeted about Stevens, saying, “Just watched the very incompetent Mitt Romney Campaign Strategist, Stuart Stevens. Now I know why Mitt lost so badly. Stevens is a clown!”

The GOP frontrunner moved on to warning about upcoming swipes against Sen. Marco Rubio (R-FL) and Hillary Clinton. “I’ve been very nice,” Trump said about Rubio. ”He hasn’t hit me. When he does, you will see what happens.”

Trump also hinted he will be going after Hilary Clinton, saying, “I haven’t even started” on her.

Trump did say he called former Florida Gov. Jeb Bush to wish him good luck after Bush suspended his campaign, but did not hear back. “I did call him to wish him the best,” Trump said, adding that it wasn’t nice that he didn’t take his call.